<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
</head>
<body>
    <form action="a" method="get">
        <label for="username"> 用户名： </label><input type="text" id="username" placeholder="请输入用户名" name="username"><br>
        <label for="password"> 密码： </label><input type="password" id="password" placeholder="请输入密码" name="password"><br>
        <input type="submit" value="登录">
    </form>
</body>
</html>